SIP strangeness on T-W cable ?

Today I am unable to connect to my usual SIP servers from my T-W cable account. I've tried two Sipura terminal adapters and the softphone in Jitsi, and I can't connect to either callcentric.com or voipdiscount.com, and the network connection is otherwise looking normal. The SIP providers are up, if I call my callcentric number from the other line it goes to voicemail as you'd expect. Anyone else seeing SIP wierdness on T-W today? R's, John